# MolestoGrmasandgramstomolesconversionsws-WITHANS

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Mole to Grams, Grams to Moles Conversions Worksheet
What are the molecular weights of the following compounds? (all masses must be to nearest hundredth)
1)
NaOH
2)
H3PO4
3)
H2O
4)
Mn2Se7
5)
MgCl2
6)
(NH4)2SO4
There are three definitions (equalities) of mole. They are:
1 mole = 6.02 x 1023 particles
1 mole = molar mass (could be atomic mass from periodic table or molecular mass)
1 mole = 22.4 L of a gas at STP (You do not need to worry about this yet)
Each definition can be written as a set of two conversion factors. They are:
1 mole = molar mass(g) can be written as
____1 mole
molar mass (g)
1 mole = 6.02 x 1023 particles can be written as
OR
____1 mole
6.02 x 1023
_molar mass (g)
1 mole
OR
__6.02 x 1023_
1 mole
Solve the following:
1)
How many moles are in 15 grams of lithium? (molar mass of lithium is 6.94 g/mole)
1 mole
= 2.1614 moles lithium = 2.2 moles Li
6.94grams
How many grams are in 2.4 moles of sulfur? (molar mass of sulfur is 32.07 g/ mole)
15 grams x
2)
2.4 moles x 32.07 grams
1 mole
=
76.97 grams sulfur
3)
How many moles are in 22 grams of argon?
4)
How many grams are in 88.1 moles of magnesium?
5)
How many moles are in 2.3 grams of phosphorus?
=
77 g Sulfur
6)
How many grams are in 11.9 moles of chromium?
7)
How many moles are in 9.8 grams of calcium?
8)
How many grams are in 238 moles of arsenic?
Solve the following:
9)
10)
How many grams are in 4.5 moles of sodium fluoride, NaF?
(molar mass of NaF is 22.99 + 19.00 = 41.99 g/ mole)
4.5 moles x 41.99 grams = 188.955 g NaF =
190 g NaF
1 mole
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3?
(molar mass of Al(OH)3 is 26.98 + (3 x 16.00) + (3 x 1.01) = 78.01 g/ mole)
98.3 grams x 1 mole
= 1.2601 moles Al(OH)3 =
1.26 moles Al(OH)3
78.01 grams
11)
How many grams are in 0.02 moles of beryllium iodide, BeI 2?
12)
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH) 2?
13)
How many grams are in 3.3 moles of potassium sulfide, K2S?
14)
How many moles are in 1.2 x 103 grams of ammonia, NH3?
15)
How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca3(PO3)2?
16)
How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO2 ?
Mole Calculation Worksheet – Answer Key
What are the molecular weights of the following compounds?
1) NaOH 22.99 + 16.00 + 1.01 = 40.00 grams/mol
2) H3PO4 3(1.01) + 30.97 + 4(16.00) = 98.00 grams
3) H2O 2(1.01) + 16.00 = 18.02 grams
4) Mn2Se7 2(54.94) + 7(78.96) = 662.60 grams
5) MgCl2 = 24.31 + 2(35.45) = 95.21 grams 6) (NH4)2SO4 2(14.01) + 8(1.01) + 32.07 + 4(16.00) =132.17 grams
Solve the following:
1)
How many moles are in 15 grams of lithium? 2.161moles = 2.2moles
2)
How many grams are in 2.4 moles of sulfur? 76.968 g = 77
3)
How many moles are in 22 grams of argon? 0.550688 moles = 0.55
4)
How many grams are in 88.1 moles of magnesium? 2141.711 grams = 2140
5)
How many moles are in 2.3 grams of phosphorus? 0.074265 moles = 0.074
6)
How many grams are in 11.9 moles of chromium? 618.8 grams = 619
g
7)
How many moles are in 9.8 grams of calcium? 0.24451 moles = 0.24
moles
8)
How many grams are in 238 moles of arsenic? 17,830.96 grams = 17,800
9)
How many grams are in 4.5 moles of sodium fluoride, NaF? 188.955 g NaF = 190
10)
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3? 1.2601 moles = 1.26
11)
How many grams are in 0.02 moles of beryllium iodide, BeI 2? 5.2562 grams = 5
12)
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2? 0.6969 moles = 0.70
13)
How many grams are in 3.3 moles of potassium sulfide, K2S? 363.891 grams = 360
14)
How many moles are in 1.2 x 103 grams of ammonia, NH3? 70.5882 moles = 71
15)
How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca3(PO3)2? 0.06398 g =
16)
How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO2? 5.6582 x 10-9 mol = 5.7
17)
How many grams are in 1.11 moles of manganese sulfate, Mn3(SO4)7? 1.11 x 837
grams
moles
g
moles
g
g
moles
g
moles
g
moles
0.064 g
x 10-9 mol
= 929.07 grams
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